intenta con este customize:

Código:
<?xml version="1.0" encoding="utf-8"?>
<customization xmlns:scs="http://scs.sonyericsson.net/xsd/CDAGInput.xsd" xmlns:s="s.data">
   
  <java>
    <midlet deletable="false" upgradeable="true" install="true" movable="true" folder="APPLICATIONS" allow-local-connection="" dataaccount="">
      <jar-file>java/Facebook_main.jar</jar-file>
      <jad-file>java/Facebook_main.jad</jad-file>
    </midlet>
    <midlet deletable="false" upgradeable="true" install="true" movable="true" folder="APPLICATIONS" allow-local-connection="" dataaccount="">
      <jar-file>java/Facebook_homescreen.jar</jar-file>
      <jad-file>java/Facebook_homescreen.jad</jad-file>
    </midlet>
  </java>
 <java>
      <settings reg-path="/apps/java">
        <jnw>
          <pdp-keepalive>false</pdp-keepalive>
        </jnw>
        <hs>
          <homescreen-available>1</homescreen-available>
        </hs>
      </settings>
    </java>
    </customization>
solo instala los .jar y .jad del facebook_main y del homescreen no el launcher y me dices.
solo eso y el customize sin los certificados.